#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int my_strlen(char* s)
{
	char* start = s;
	while (*s != '\0')
	{
		s++;
	}
	return s - start;
}

int main()
{
	char arr[] = "abcdef";
	int len = my_strlen(arr);
	printf("%d\n", len);
	return 0;
}



